It appears that the switch from KXml2Driver to StandardStaxDriver in JENKINS-69129 (included in 2.387.3-rc33338.349f385d65d2 as well as weeklies) broke the ability to round-trip ASCII NUL characters in text. Prior to the change, this character was written as � and (whether correct or not) read back successfully. After the change, it is still written the same way, but cannot be read.
Seems unlikely to affect many users, though it may affect the Jenkins project itself: for example
mvn -pl test surefire:test -Dtest=ExecutorTest#disconnectCause_WithoutTrace -Dmaven.test.redirectTestOutputToFile=true
causes TEST-hudson.model.ExecutorTest.xml to include
<===[JENKINS REMOTING CAPACITY]===>&#0;&#0;&#0;channel started
which looks to be bogus output from Surefire but which does not trigger a problem, whereas hudson.model.ExecutorTest-output.txt contains
<===[JENKINS REMOTING CAPACITY]===>^@^@^@channel started
(with ^@ standing in for actual ASCII NUL for display). In case the NUL makes it into a stdout field in junitResult.xml, the symptom is that the junit step publishes test results normally (setting the build status, sending checks to GitHub, etc.) but if you visit the testReport/ display in the GUI, it claims there are no tests found (after printing a stack trace to the system log about a parse error). Other plugins looking up test results (such as parallel-test-executor) can also be affected.
causes
JENKINS-71182unicode character in build name causes issue in 2.403
As far as I can tell, it is not possible to encode NUL in XML at all, in which case it would suffice to ensure that the junit plugin does not attempt to do so (and the core PR could either be closed or amended to just demonstrate the expected behavior).
Jesse Glick
added a comment - As far as I can tell, it is not possible to encode NUL in XML at all, in which case it would suffice to ensure that the junit plugin does not attempt to do so (and the core PR could either be closed or amended to just demonstrate the expected behavior).
Noting that the proposed PRs do not fix the symptoms, rather avoid the condition that caused it (by failing fast serialization of invalid xml, and fixing the junit plugin to not produce invalid xml).
This means test reports of existing builds produced using an older junit plugin will still be unreadable with the new version, unless https://github.com/jenkinsci/jenkins/pull/7778 is eventually reverted.
Vincent Latombe
added a comment - Noting that the proposed PRs do not fix the symptoms, rather avoid the condition that caused it (by failing fast serialization of invalid xml, and fixing the junit plugin to not produce invalid xml).
This means test reports of existing builds produced using an older junit plugin will still be unreadable with the new version, unless https://github.com/jenkinsci/jenkins/pull/7778 is eventually reverted.
Good point; noted in the core “proposed upgrade guidelines”.
Kris Stern (not sure of your Jira id): I am leaving this marked lts-candidate though I do not think it is necessary to delay 2.387.3 for it, given the junit fix, so long as a mention is made in the LTS changelog / upgrade guidelines.
Jesse Glick
added a comment - Good point; noted in the core “proposed upgrade guidelines”.
Kris Stern (not sure of your Jira id): I am leaving this marked lts-candidate though I do not think it is necessary to delay 2.387.3 for it, given the junit fix, so long as a mention is made in the LTS changelog / upgrade guidelines.
Kris Stern
added a comment - - edited jglick Just seeubg your comment to me now. I have just made a backporting PR for this. For details, please see: https://github.com/jenkinsci/jenkins/pull/7885 .
krisstern I don't think that we need to backport https://github.com/jenkinsci/jenkins/pull/7875 to 2.387.3 LTS. It may need to be backported to 2.401.1. Kevin will add a note to the upgrade guide that users need to update to most recent release of junit plugin
Mark Waite
added a comment - krisstern I don't think that we need to backport https://github.com/jenkinsci/jenkins/pull/7875 to 2.387.3 LTS. It may need to be backported to 2.401.1. Kevin will add a note to the upgrade guide that users need to update to most recent release of junit plugin
markewaite Okay, maybe I should close the PR then?
Kris Stern
added a comment - markewaite Okay, maybe I should close the PR then?
Jesse Glick
Jesse Glick
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As far as I can tell, it is not possible to encode NUL in XML at all, in which case it would suffice to ensure that the junit plugin does not attempt to do so (and the core PR could either be closed or amended to just demonstrate the expected behavior).